2021 NHIS Questionnaires, Datasets, and Documentation

Overview

Resources on this page provide information about the 2021 National Health Interview Survey (NHIS) data collection, its participants, and its protocols, as well as analytic notes and references. They will help you understand, analyze and use the 2021 NHIS data.

Using our data

• Survey description document 
• Imputed income technical document 
• File record length and size summary 
• Checksum
• Industry and occupation supplement 

Restricted Data

Researchers can access restricted NHIS data through the National Center for Health Statistics Research Data Center.

• Restricted-use variable access
• Restricted-use geography data
  • Geocode technical documentation

Questionnaires and survey materials

Sample adult interview

Sample child interview

Parent-child pair data

Imputed income

Paradata

Earlier NHIS data

Get older NHIS data documentation from the CDC Archive.

Find more

• 2024 NHIS Questionnaires, Datasets, and Documentation
• 2023 NHIS Questionnaires, Datasets, and Documentation
• 2022 NHIS Questionnaires, Datasets, and Documentation
• 2020 NHIS Questionnaires, Datasets, and Documentation
• 2019 NHIS Questionnaires, Datasets, and Documentation